SEPARATOR FOR NON-AQUEOUS SECONDARY BATTERY, SECONDARY BATTERY, AND MANUFACTURING METHOD OF SECONDARY BATTERY
A separator for a non-aqueous secondary battery includes: a polyimide porous film; and adhesive resin particles that are attached to a surface of the polyimide porous film and have a responsiveness to at least one of pressure and heat.
1 . A separator for a non-aqueous secondary battery, comprising:
a polyimide porous film; and
adhesive resin particles that are attached to a surface of the polyimide porous film and have a responsiveness to at least one of pressure and heat.
2 . The separator for a non-aqueous secondary battery according to claim 1 ,
wherein when an average pore diameter of the polyimide porous film is set to X, and an average particle diameter of the adhesive resin particles is set to Y, a relationship of X<Y is satisfied.
3 . The separator for a non-aqueous secondary battery according to claim 2 ,
wherein a ratio Y/X of the average particle diameter Y of the adhesive resin particles to the average pore diameter X of the polyimide porous film is more than 1.0 and 70.0 or less.
4 . The separator for a non-aqueous secondary battery according to claim 1 ,
wherein an attachment amount of the adhesive resin particles with respect to the surface of the polyimide porous film is 0.5 g/m 2 or more and 5.0 g/m 2 or less.
5 . The separator for a non-aqueous secondary battery according to claim 2 ,
wherein an attachment amount of the adhesive resin particles with respect to the surface of the polyimide porous film is 0.5 g/m 2 or more and 5.0 g/m 2 or less.
6 . The separator for a non-aqueous secondary battery according to claim 3 ,
wherein an attachment amount of the adhesive resin particles with respect to the surface of the polyimide porous film is 0.5 g/m 2 or more and 5.0 g/m 2 or less.
7 . The separator for a non-aqueous secondary battery according to claim 4 ,
wherein the attachment amount of the adhesive resin particles with respect to the surface of the polyimide porous film is 0.8 g/m 2 or more and 4.8 g/m 2 or less.
8 . The separator for a non-aqueous secondary battery according to claim 5 ,
wherein the attachment amount of the adhesive resin particles with respect to the surface of the polyimide porous film is 0.8 g/m 2 or more and 4.8 g/m 2 or less.
9 . The separator for a non-aqueous secondary battery according to claim 1 ,
wherein the adhesive resin particles are pressure-responsive particles.
10 . The separator for a non-aqueous secondary battery according to claim 9 ,
wherein the pressure-responsive particles contain a styrene-based resin containing a styrene and a vinyl monomer other than the styrene as a polymerization component, and a (meth)acrylic ester-based resin containing at least two types of (meth)acrylic esters as a polymerization component, have at least two glass transition temperatures, and have a difference between the lowest glass transition temperature and the highest glass transition temperature of 30° C. or higher.
11 . The separator for a non-aqueous secondary battery according to claim 10 ,
wherein a mass ratio of the at least two types of (meth)acrylic esters to the entire polymerization component of the (meth)acrylic ester-based resin is 90 mass % or more.
12 . The separator for a non-aqueous secondary battery according to claim 10 ,
wherein a mass ratio of the styrene to the entire polymerization component of the styrene-based resin is 60 mass % or more and 95 mass % or less.
13 . The separator for a non-aqueous secondary battery according to claim 10 ,
wherein two types of (meth)acrylic esters having a highest mass ratio in the at least two types of (meth)acrylic esters contained in the (meth)acrylic ester-based resin as the polymerization component are alkyl (meth)acrylic esters, and a difference in number of carbon atoms of alkyl groups between the alkyl (meth)acrylic esters is 1 or more and 4 or less.
14 . The separator for a non-aqueous secondary battery according to claim 1 ,
wherein the polyimide porous film has a porosity of 50% or more and 90% or less and an air permeance of 5 seconds/100 mL or more and 100 seconds/100 mL or less.
15 . The separator for a non-aqueous secondary battery according to claim 14 ,
wherein the polyimide porous film has the porosity of 55% or more and 85% or less.
16 . The separator for a non-aqueous secondary battery according to claim 1 ,
wherein an average pore diameter of the polyimide porous film is 50 nm or more and 1500 nm or less.
17 . The separator for a non-aqueous secondary battery according to claim 16 ,
wherein the average pore diameter of the polyimide porous film is 50 nm or more and 1000 nm or less.
18 . The separator for a non-aqueous secondary battery according to claim 1 ,
wherein a tensile breaking strength of the polyimide porous film is 10 MPa or more.
19 . A secondary battery, comprising:
an electrode; and
the separator for a non-aqueous secondary battery according to claim 1 ,
wherein an adhesive layer of the adhesive resin particles is provided between the electrode and the polyimide porous film.
20 . A manufacturing method of a secondary battery, comprising:
allowing the separator for a non-aqueous secondary battery according to claim 1 to adhere to an electrode by at least one of pressure and heat.